Aerial images showing containers at the port in Nanjing, in China's eastern Jiangsu province, as Beijing says it will impose tariffs on imports of US energy, vehicles and equipment. The move was a return salvo in an escalating trade war between the world's two biggest economies, and followed US President Donald Trump announcing sweeping measures against major trade partners Canada and Mexico, with goods from China hit with an additional 10 percent tariff on top of the duties they already endure. STOCKSHOTS